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y in (-oo:+oo)
(-8/5)*(y-25)-((1/15)*y) = 0
(-8/5)*(y-25)+(-1/15)*y = 0
-8/5*(y-25)-y/15 = 0
(-8/5*15*(y-25))/15-y/15 = 0
-8/5*15*(y-25)-y = 0
600-25*y = 0
(600-25*y)/15 = 0
(600-25*y)/15 = 0 // * 15
600-25*y = 0
600-25*y = 0 // - 600
-25*y = -600 // : -25
y = -600/(-25)
y = 24
y = 24
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